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Abstract

Refresh strategies for distributed database directories, commonly recommended for the X.500 standard, are defined and analytically modeled for variations on push/pull and total/differential options under ideal asynchronous control conditions. The models are implemented in a Hyper- Card-based tool called DirMod (ODirectory ModelO). Experimental test results show an important elapsed time/ performance trade-off among the different strategies, and test data contribute to the verification of the models.